<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app"></div>
    <script src="../js/react.development.js"></script>
    <script src="../js/react-dom.development.js"></script>
    <script src="../js/babel.min.js"></script>
    <script type="text/babel">
        class MyComponent extends React.Component {
            state = {
                isHot: true
            }
            render () {
                const { isHot } = this.state
                return <h1 onClick={this.changeIsHot}>今天天气真{isHot ? '炎热' : '凉快'}</h1>
            }
            changeIsHot = () => {
                console.log(this)
            }

            // changeIsHot () {
            //     console.log(this)
            // }
        }

        ReactDOM.render(<MyComponent />, document.getElementById('app'))
    </script>
</body>

</html>